甲状腺乳头状癌BRAF V600E基因突变 及相关蛋白的表达

背景与目的:BRAF V600E基因突变可作为甲状腺乳头状癌靶向治疗的靶点,因此检测患者BRAF基因状态对于能否应用靶向药物治疗具有重要意义.观察BRAF V600E基因突变及突变蛋白VE1在甲状腺乳头状癌中的表达情况,并分析其与甲状腺乳头状癌的临床病理特征及其预后的关系.方法:采用DNA测序法及免疫组织化学法分别检测108例甲状腺乳头状癌、54例甲状腺腺瘤和54例结节性甲状腺肿标本中BRAF基因突变及其相关蛋白VE1的表达.结果:108例甲状腺乳头状癌基因突变率为67.6%,VE1表达率为64.8%,与甲状腺良性病变相比差异有统计学意义(P<0.05),与临床病理参数间无相关性.结论:甲状腺乳头状癌BRAF V600E基因突变率和BRAF V600E蛋白表达水平增高,可以作为鉴别甲状腺良、恶性肿瘤的有效指标.免疫组织化学法检测甲状腺乳头状癌BRAF V600E蛋白的表达与其基因突变的一致性高,可间接有效地反映BRAF V600E基因突变的状态.BRAF V600E基因突变及突变蛋白的表达与甲状腺乳头状癌患者预后无关.

BRAF V600E mutation and expression of its protein in papillary thyroid carcinoma

Background and purpose:The BRAF V600E mutation is a highly attractive drug target. Therefore, determining the BRAF gene mutation status of patients is essential in order to assess patients' eligibility for targeted BRAF geneinhibitor therapy. The aim of this study was to validate the utility of immunohistochemistry to rapidly obtain the BRAF gene mutation status. This study aimed to analyze the correlation of the BRAF V600E gene mutation and VE1 protein ex-pression with the clinical pathological characteristics in papillary thyroid carcinoma (PTC).Methods:The mutation status of BRAF V600E was detected by DNA sequencing. Immunohistochemistry was used to detect the expression of BRAF V600E protein in 108 cases of PTC, 54 cases of thyroid adenoma and 54 cases of normal thyroid tissue.Results:The gene mutation rate of BRAF V600E is 67.6%, and VE1 protein expression rate is 64.8% in 108 cases of PTC. The differences were statistically significant compared with thyroid adenoma and goiter (P<0.05), but have no correlation with the clinical pathological characteristics.Conclusion:BRAF V600E gene mutation and VE1 protein expression are useful biomarkers for the pathological diagnosis of PTC. High consistency was observed between the immunohistochemical staining results and the DNA sequencingresults of BRAF V600E gene mutations. Immunohistochemical technique detecting the BRAF V600E protein expression can effectively reflect indirectly BRAF V600E gene mutation status in PTC.BRAF V600E gene mutation has no contribution to the development of papillary thyroid carcinoma.